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Directional video filters for locally adaptive spatial noise reduction

  • US 20050135699A1
  • Filed: 12/23/2003
  • Published: 06/23/2005
  • Est. Priority Date: 12/23/2003
  • Status: Active Grant
First Claim
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1. A method of reducing spatial noise in an image having a plurality of pixels, comprising:

  • detecting object boundaries and unstructured areas in the image by applying 3-tap high pass filters to each pixel in the image in at least four directions to determine the best direction(s) for local low pass filtering; and

    applying low pass filtering only along object boundaries and unstructured areas within the image so as to minimize the tendency to blur image edges.

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